> -----Original Message----- > From: Andrew Lunn <[email protected]> > Sent: Tuesday, February 24, 2026 12:27 PM > To: Shenwei Wang <[email protected]> > Cc: Arnaud POULIQUEN <[email protected]>; Linus Walleij > <[email protected]>; Bartosz Golaszewski <[email protected]>; Jonathan Corbet > <[email protected]>; Rob Herring <[email protected]>; Krzysztof Kozlowski > <[email protected]>; Conor Dooley <[email protected]>; Bjorn Andersson > <[email protected]>; Mathieu Poirier <[email protected]>; Frank Li > <[email protected]>; Sascha Hauer <[email protected]>; Shuah Khan > <[email protected]>; [email protected]; linux- > [email protected]; [email protected]; Pengutronix Kernel Team > <[email protected]>; Fabio Estevam <[email protected]>; Peng Fan > <[email protected]>; [email protected]; linux- > [email protected]; [email protected]; linux-arm- > [email protected]; dl-linux-imx <[email protected]>; Bartosz > Golaszewski <[email protected]> > Subject: [EXT] Re: [PATCH v8 3/4] gpio: rpmsg: add generic rpmsg GPIO driver > > Caution: This is an external email. Please take care when clicking links or > opening > attachments. When in doubt, report the message using the 'Report this email' > button > > > > Regarding type, it’s needed, especially for the in packets. There are > > two distinct kinds of incoming > > packets: notification‑in and reply‑in. Because of that differences, > > Combining cmd and type would blur that distinction and complicate the > implementation. > > [Goes and looks at gpio-virtio] >
They aren’t comparable. gpio‑virtio represents a single virtio device(transport) mapped to a single GPIO controller — a strict 1:1 relationship. RPMSG, on the other hand, is a bus‑style transport. Multiple GPIO controllers can run over the same RPMSG channel. Thanks, Shenwei > https://elixir.bootl/ > in.com%2Flinux%2Fv6.19.3%2Fsource%2Finclude%2Fuapi%2Flinux%2Fvirtio_gpio > .h%23L13&data=05%7C02%7Cshenwei.wang%40nxp.com%7C59d9438500554b > 9d6a5e08de73d246cb%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C > 639075544153317722%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRy > dWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D > %3D%7C0%7C%7C%7C&sdata=7fcyGY6KVuRqTIivhZbM4PK8PNTALI%2BScOfxM > yaPVh8%3D&reserved=0 > > /* Virtio GPIO request types */ > #define VIRTIO_GPIO_MSG_GET_NAMES 0x0001 > #define VIRTIO_GPIO_MSG_GET_DIRECTION 0x0002 > #define VIRTIO_GPIO_MSG_SET_DIRECTION 0x0003 > #define VIRTIO_GPIO_MSG_GET_VALUE 0x0004 > #define VIRTIO_GPIO_MSG_SET_VALUE 0x0005 > #define VIRTIO_GPIO_MSG_IRQ_TYPE 0x0006 > > Andrew
